4P16: Crystal Structure Of The Papain-like Protease Of Middle-east Respiratory Syndrome Coronavirus

Citation:
Abstract
The Middle-East Respiratory Syndrome coronavirus (MERS-CoV) causes severe acute pneumonia and renal failure. The MERS-CoV papain-like protease (PL(pro)) is a potential target for the development of antiviral drugs. To facilitate these efforts, we determined the three-dimensional structure of the enzyme by X-ray crystallography. The molecule consists of a ubiquitin-like domain and a catalytic core domain. The catalytic domain displays an extended right-hand fold with a zinc ribbon and embraces a solvent-exposed substrate-binding region. The overall structure of the MERS-CoV PL(pro) is similar to that of the corresponding SARS-CoV enzyme, but the architecture of the oxyanion hole and of the S3 as well as the S5 specificity sites differ from the latter. These differences are the likely reason for reduced in vitro peptide hydrolysis and deubiquitinating activities of the MERS-CoV PL(pro), compared to the homologous enzyme from the SARS coronavirus. Introduction of a side-chain capable of oxyanion stabilization through the Leu106Trp mutation greatly enhances the in vitro catalytic activity of the MERS-CoV PL(pro). The unique features observed in the crystal structure of the MERS-CoV PL(pro) should allow the design of antivirals that would not interfere with host ubiquitin-specific proteases.
PDB ID: 4P16Download
MMDB ID: 119615
PDB Deposition Date: 2014/2/25
Updated in MMDB: 2014/08
Experimental Method:
x-ray diffraction
Resolution: 2.5  Å
Source Organism:
Similar Structures:
Biological Unit for 4P16: dimeric; determined by author and by software (PISA)
Molecular Components in 4P16
Label Count Molecule
Proteins (2 molecules)
2
Orf1a
Molecule annotation
Chemicals (2 molecules)
1
2
* Click molecule labels to explore molecular sequence information.

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